Controlling system.



H. W. CHENEY CONTROLLING SYST. :1,

AFPLIGATION FILED APB,

lowil fi.

INVENTOF? w; 1 A e B 2, M 7% V ie irssr DFFIClt,

er w. CHENEY, or sronwoon, em, essreieos, .sY 'MESNE essremsn'rs, so

. e e ooRPoRA'rIoN or DELAWARE. ohm-1s i essence Application filcll 6.1331116, 1886.

whom it may concern: Be known tlet l, HERBERT W. fissile of the imited States, ocl, the county of Hamilton n Ohio, have inventecl 'zo. tiui: Improvements in Jontroll of which the following is e full, and exact specification. in estion relates to motor control systems and particularly to automatic control systems for electric motors carrying a veryload.

is the object of this invention to provide oroveol system of control which is perly applicable to a motor driving a able load.

The single figure of the drawing shows ne embodiment of my invention, portly diagrammatically. 2o

is a motor which is to dri e-e variable load. Thismotor ISShOWll es threephese induction motor, though obviously-my mslon'is not limited to this type or motor,

but is socially e pplicacle' to motcrs'of other types. 'ueohenicaily connected to the roas elelient of this motor, as by moustegl on the same shaft, is a rhearings C are provided. The suppliecl from A suitablethreesource by mains 2 W. and

.ln the rotor circuit of-the motor is a start- 111g resistance 1, 2, 8, these 'three'parts of the resistance leeing shown star connectecl. The

starting resistance is errangecl to be gradually cut out by the usual manual controller 4:. Also connected in the rotor circuit, and in s Withthe starting reslstauce l, 2, 3, is e misting resistezcuze 5, 6, 'Z, c inch 1s url to be short-circuitecl under certain trons by the electrically ope'reteii hes 8 and '9. Each of these swit circuits one section of the legllill'fililg he number of sections seine the 5, e number of solenolci switches, 1? them being here shown. The soleis end 11 of these switches are out};- from any suitable source of current ough. the switch 19, and it is necessary the arm of the starting controller 4; he in running ing, in order that the circuits and ll be completed. The ll, are also controlled by 12 end 13, the solenoicls'le'ancl 15 of r e1=eres onsive to the strength or solenoids l0 solenoids 10sec solenoid sw tches of the oairrei'it position, as shown in the clrew- Specification of Letters latent.

residing at creased load. A still Patented Feb. 2, 1915. Serial No. 311,845.

supglie motor" A, as being connected to said; circuit through series transformers l6 anti 1' These transformers heve different ratios of transformation so thet-switc'h 12 is onenocl at a smaller current than is switch 13. is obvious that the transformers the same-ratio of transformation, the number ofturns on 14 and 15 vemeti to get the same result.

-'-ll'1e operation of the system is as follows: he motor A- is started by clos= mg the switch 18 end 'by cutting-out the starting resistance 1, 2, 8, by thev controller 4. After the starting controller is in running position, :but not until then, the circuits of solenoids 10 and 11 mey he corn pletetl by switches 12 and I3. If-the loud onthemotcr is light there is comparatively small current in the mains 21,22,211161 23 aiud the switches 12 and l3 are closed to energize solenoids ill-end 11 to short-circuit the regulating resistance 5, 6, 7. runs to drive the load and to supply energy to the fiy-wheel B. e load on the motor is increased. current in themeins rises. If the lee-til,

mey have The motor sow ceerls e prcdetermined amount, m m -,3;

tcr-,-ellowing itto slow downfsomewhehso that-the fly-wheel may give up part ct energy it has store'tl'to help iirive the in greater rise in the least causes the other half of the regulating resistance 5, 6, 7 to be cut in, by the action of switches 13-21169, thereby permitting it see furtheriirop in speed, end-e still greater as sisting action from the fly-wheel. When the lead falls oil" the resistance is again out out of" the rotor circuit, thus causing the motor to speed up again; The value of the load Whenthe resistance is cuttout of circuit is less than when the resistance is cutin because it requires less current to hold us switches 12 and 13 th switches.

It is obvious that the solenoids l0 encl 11-, could be readily omittetlenfl thet the noicls l4 and 15 could he errengecl'to o ete'theewltehesSentli) directly.

an to raise forcutting i a fiy-wheel driven thereby,

have described what I now consider to be thepreferred embodiment of my invention, I do not wish to be limited to the precise structure shown and described, but claim as mine all such obvious modifications as readily occur to one skilled in the art.

'What I claim as new, and desire to secure by Letters Patent is 1. In combination, an induction motor, a flywheel mechanically connected thereto, a starting resistance in the secondary circuit Although I of said motor, manually, operated means for cutting out said starting resistance, a second resistance in said secondary circuit, and automatic means for shunting said second resistance after the starting resistance has been output and for opening said shunt whenever the current in the primary circuit of the motor exceeds a predetermined value. 2. combination, a three-phase induction. motor, a fly-wheel mechanically connected thereto, a starting resistance in the rotor circuit of the motor, means for cut ting out said starting resistance, a secon resistance arranged in said rotor circuit, a plurality of electrically operated switches W said second resistanceinto or out vof circuit step by step in accor ance with the rise or fall of'load on the motor, and connections whereby saidsecond resistancecan only be cut out after the starting resistancehas been completely out out.

in combination with an electric motor,

a starting resistance therefor, a manually -controlled switch for cutting said resistance out oi: circuit, and a plurality oi tuated switches arranged to cut portions 0 said resistance into circuit, the actuating magnet windings being ranged to actuate said switches successively when the load on the motor termined amounts.

4.111 combination with an electric motor, a fly-wheel driven thereby, a starting resistance therefor, a manually-controlled, switch for cutting'said resistance out of circuit, and means controlled by the load" on said motor for cutting portions of said resistance successively into circuit when the load on the motor exceeds predetermined amounts 5. In combination with an electric motor,

' thereby, a. starting rea fly-wheel driven sistance therefor, a plurality' of magnetically-actuated contacts for short-circultmgportions ofsaid resistance, a manually-operated starting switch controlling the actuating magnets for said contacts, magnetically-actuated means controlling said magnet windingsand connections for supplying to the actuating winding of said controlling means a current varying with'theload on the motor,

(5. In combination, an induction mot r,

magnetically-ac connected and ar-- exceeds prede-.

fly-wheel driven thereby; a resistance in the secondary circuit of said motor, a manuallycontrolled starting switch for cutting said resistance out of circuit, a magnetically-actuated switch for cutting a portion of said resistance into circuit, and connections for supplying to the actuating winding of said switch a current varying with the load on the motor.

said switches controlled one by hand and the other magnetically, and connections for sup ply ng to the controlhng'ma'gnet cf the latter switch a current varying wit, the load on the motor.

9. In a motor control system, a motor, a"

fiy-wheel' driven thereby, a resistance in the circuit of said motor, and means for -manually controlling a part of said resistance and for automatically controlling another part of said resistance, the automatic control being eidective only after the manual control has been itully exercised.

10. in ,a motor control system, a motor, a

fly-wheel driven thereby, a resistance there for, and means for successively purely inanually and jointly manually and automatically controlling parts of said resistance, the automatic control being effective only after the manual control has been exercised.

11. in combination, an induction motor, a tly-wheel driven thereby, a resistance in the secondary circuit of said motor, a man ually controlled starting switch for varying the resistance of said secondary circuit, a magnetically actuated switch for also varying the resistance of said circuit, and connections for supplying to the actuating; windings'of said switch a current varying with the load on the motor, said automatically actuated switch being operative only when said manually controlled switch has been operated to cut out a portion of said resistance. a

12. In combination with an electric motor, a flywheel driyen thereby, a resistance adapted to be inserted in the motor circuit to cause the motor to run at reduced speed to permit the flywheel to give up a portion of its ener means for purely inanually centre a of lid lLZh

anti for jointly automatically an'cl manually cont ng another part of saicl resistance.

13. combination, an induction motor, a variable resistance in the secondary of said motor, means for manually controlling a portion of said resistance, and means for automatically controlling another portion of said resistance and operable only when a part of the manually controlled portion has been cut out.

1 In combination with an electric motor, a resistance therefor, and means for purely manually controlling a part of said resistance-and for automatically controlling another part of said resistance, said means eiiecting automatic control only after a por tion of said manually controlled part of saicl resistance has been cut out.

15. In a motor control system, a motor, a controlling resistance therefor comprisinga plurality of sections in series arrangement, means for manually controlling one section of said resistance and for subsequently automatically controlling another section of d resistance, said automatic control being effective only when a portion of saicl inannally controlletl section has been rendered inactive;

16. In combination with an electric inotor, a fiy-c'lieel driven thereby, a resis ance in the circuit of said motor, means va ing saicl resistance, magnetically actnat contacts for varying the effect of portio' of said resistance, and a pliiralit" switches jointly controlling the actuatin. magnets for said contacts, one of sai switches being controlled, by basil and erative only after a portion of said resi ance has been out out by said. first mentioned resistance varying means, and the remaining switch or switches being automatically controlled by the load on the motor.

11'. In a motor control system, a motor,

a resistance in the circuit of said motoin means operative at the Will of the operator I for controllin the resistance of said circuit, and means or automatically controlling said resistance, said latter means being operative only after a portion of said rcsistonce has been cut out by said first mentioned means.

in testimony whereof I my'signatnre, in the presence of two Witnesses.

W. CHE 

